In humans, the allantois:a
stores embryonic nitrogenous wastes.
b. eliminates nitrogenous wastes from the embryo.
c. contributes to the formation of the blood vessels in the umbilical cord.
d. secretes amniotic fluid.
e. serves as a temporary center for formation of blood cells.
C
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Volatile chemical substances that elicit specific responses in other members of the same species are referred to as
A. hormones. B. pheromones. C. transposons. D. pectines. E. spicules.
Spermatogenesis takes place in which of the following structures?
a. seminiferous tubules b. seminal vesicles c. prostate gland d. bulbourethral glands e. glans
A molecule consists of ____.
A. radioactive compounds B. two or more atoms of the same element C. electrically charged elements D. elements with one or more extra neutrons E. atoms held together by chemical bonds
The smaller unit molecules (monomers) which combine to form proteins and polypeptides are called ____________.
a. amino acids b. fatty acids c. monosaccharides d. nucleotides